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History of Research Project on CCA-Treated Wood Presented July 9, 2001 Sarasota County, Florida

History of Research Project on CCA-Treated Wood Presented July 9, 2001 Sarasota County, Florida. Funding Received from Florida Center for Solid and Hazardous Waste Mngt. Florida Power and Light and Sarasota County. Faculty Researchers. Helena Solo-Gabriele , Ph.D., P.E.,

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History of Research Project on CCA-Treated Wood Presented July 9, 2001 Sarasota County, Florida

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  1. History of Research Project on CCA-Treated WoodPresented July 9, 2001Sarasota County, Florida

  2. Funding Received from Florida Center for Solid and Hazardous Waste Mngt. Florida Power and Light and Sarasota County

  3. Faculty Researchers Helena Solo-Gabriele, Ph.D., P.E., Assoc. Prof., Civil/Environ. Engrg Timothy Townsend, Ph.D. Assoc. Prof., Environ/Solid Waste Engrg David Hahn, Ph.D. Assist. Prof., Mechanical Engrg. Yong Cai, Ph.D. Assist. Prof., Chemistry

  4. Students Supported on Project • Sean Bennie • Vandin Calitu • Kelvin Gary • Naila Hosein • Gary Jacobi • Bernine Khan • Monika Kormienko • Jennifer Penha • Catalina Santamaria • Donna May Sakura • Jenna Jambeck • Tim Franklin • Brian Messick • Jin-Kun Song • Kristin Stook (recent graduate) • Thabet Tolaymat

  5. Background • CCA-Treated Wood is the most common wood preservative used today (>80% market) • CCA ---> Chromated Copper Arsenate

  6. Background Saltwater Immersion Pole/Pilings Structural Poles Saltwater Splash Above Ground pcf = pounds of CCA per cubic foot of wood

  7. Background • CCA ---> Chromated Copper ArsenateThe treated wood contains very high concentrations of Cr, Cu, and As • As toxic, known carcinogen • Soil background levels for arsenic in Florida are low • Strict disposal guidelines

  8. Why Was this Project Initiated? • High metals concentrations were observed in the ash from wood cogeneration facilities located in Florida

  9. Year 1 (1996-1997)

  10. Year 1: Disposal Forecast

  11. CCA-WoodRemoved from Service C&D Debris Recycling Facilities Wood Fuel Facility Ash Processed Wood (6% CCA in 1996) MSW Landfill C&D Landfill Land Application

  12. Year 2 (1997-1998)

  13. Year 2 • Leaching Studies, ash • Hazardous when CCA-treated wood represents 5% of wood burned • Solvents can extract metals from ash, citric acid very promising (40 to 100% As removed) ------> Explore Potential Recycling? Develop Tools for Disposal End Management

  14. Year 2 (continued) Untreated Treated • Sorting Studies, Laboratory • Chemical stains, low capital costlabor intensive • X-ray methods, high capital costsuitable for on-line system

  15. Year 3 (1998-1999)

  16. Year 3 • Disposal-End Management • Field Demonstration of Sorting Technologies Stains suitable for sorting small quantities of wood • Evaluation of Pyrolysis Technology Appears promising for ultimate disposal • Resource book for Wood Disposal Sector

  17. Year 3 (Continued) • Alternative Chemicals • Four Promising Alternative Chemicals for CCA: ACQ, CBA, CC, CDDC • All standardized for applications requiring 0.25 & 0.4 pcf Comparable to CCA: efficacy • Leach less As but generally more Cu • Cost 10 to 30% more at retail establishment

  18. Ash Problem Inventory Sorting Lab Ash Char & Trt Sorting Field Alt. Chem. Lit Review On-going On-going

  19. The Research Team Was Invited to the Minnesota Proceedings • Minnesota’s Listed Metals Advisory Council[Cd, Pb, Hg, and Cr(VI)] • Speciation Debated • In-Service Issues Debated • Lack of Scientific Data

  20. Year 3 Supplemental • Impacts of CCA on Soil during In-Service Use • Use Sectors for CCA-Treated Wood • Leaching of CCA-treated Wood and C&D Debris Wood Mulch • Literature Reviews, Alt. Chem.Cr & As Speciation Deck Study Use Sectors Minnesota Leaching Wood & Mulch Lit Reviews Alt Chem, As, Cr Spec

  21. Leaching of CCA During In-Service Use Year 3 Supplemental

  22. Leaching of CCA-Treated Wood During In-Service Use Year 3 Supplemental

  23. FDEP Industrial SCTL Not CCA-Treated Leaching of CCA-Treated Wood During In-Service Use Chemicals Do Leach from CCA-treated Wood During In-Service Use

  24. Leaching of CCA-Treated Wood During In-Service Use Approximately 39 square miles of Florida land covered by CCA-treated decks. Top 8 inches of this area would correspond to 60 million tons of soil.

  25. Use Sectors for CCA-Treated Wood Year 3 Supplemental

  26. Use Sectors for CCA-Treated Wood

  27. Use Sectors for CCA-Treated Wood Year 3 Supplemental

  28. 28,600 tons of As, Cumulative 1600 tons As imported per year In-service losses (10%): 2900 tons Disposed to date: 1600 tons Future disposal (for that imported through 2000): 24,100 tons Year 3 Supplemental

  29. Leaching of CCA-treated Wood and C&D Debris Wood Mulch Year 3 Supplemental

  30. Leaching of CCA-Treated Wood

  31. Leaching of Mulch Year 3 Supplemental

  32. Ash Problem Inventory Sorting Lab Ash Char & Trt Deck Study Sorting Field Alt. Chem. Lit Review Use Sectors Minnesota On-going Leaching Wood & Mulch Lit Review Alt Chem, As, Cr Spec On-going

  33. On-going On-going On-going On-going Alt. Chem. Leaching As Spec GW @ LF Cr Spec As Spec. Lysimeters TCLP - unburned Alt. Chem. Toxicity Sorting Study As Spec. Lysimeters (cond) TCLP - ash As Reserviors Recently Funded

  34. Questions?Comments?

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